【STEPLESS SPEED】From 3,000 to 20,000 RPM (Revolutions per Minute). Usually, Low speed for metal/wood, fast speed for glass/ceramic 【DURABLE AND RELIABLE】Electric portable drill is suitable for decorating or personalize a wide variety of materials including metal, plastic, glass, ceramic, wood, leather and more; Engrave for protection against theft. 【COMFORTABLE & EASY TO CONTROL】Just holds it like holding a pen, lightweight & compact design, letting you perform intricate work smoothly and effortlessly. Easily control the engraving/drawing path. Makes smooth and clear strokes. 【BUY WITH CONFIDENCE】Our customer service always stand by for your 100% satisfied, like it just adds it to cart! One year warranty for every purchase, 30 days money back.